170810-M-HR246-0314 ALPENA, Mich. (Aug. 10, 2017) Cpl. Joshua T. Thimmesh, crew chief of a UH-1Y Huey helicopter assigned to Marine Light Attack Helicopter Squadron 269, fires a GAU-17/A mini-gun during exercise Northern Strike 17 at the Combat Readiness Training Center in Alpena, Mich. The joint exercise is hosted by the Michigan Air National Guard and emphasizes close air support and joint fire support to enhance combat readiness. (U.S. Marine Corps photo by Lance Cpl. Cody Ohira/Released)